• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2004년도 유체기계 연구개발 발표회 논문집
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• pp.660-664
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• 2004

The flow fields of a lubrication oil pump has been simulated by using CFD in order to improve performance of the pump. The grid for the one flow passage is applied for estimating pump performance. The calculation result shows that there are unfavorable flow characteristics of flow recirculation in the casing part by the guide vane. Thus, the guide vane is modified to reduce the recirculation region. Performance test shows that the modified model pump efficiency is increased by $6\%$ at the rated point compared to that of the original model.

• 대한의용생체공학회:의공학회지
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• 제19권1호
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• pp.33-38
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• 1998

심장내 이식형 축류 혈액 펌프의 개발을 시도하였다. 이 펌프는 해부학적인 적합성이 좋고, 혈액과 접촉하는 면적이 적으며, 심장판막의 위치에 이식할 수 있어 이식술이 용이한 등의 이점이 있다. 축류혈액펌프는 입펠러와 소형 모터에 의해 구성되었으며, 모터축과 펌프의 본체의 밀봉은 자성유체 축봉이 이용되었다. 본 연구에서 개발한 혈액펌프의 펌프 특성은 4매 임펠러의 경우 회전수 7091[rmp], 6매 임펠러의 경우 회전수 6402[rpm]에서 유량 5[l/min], 차압 100[mmHm]을 얻을 수 있었으며, 자성유체 축봉의 내압 특성은 회전수 7000[rpm], 압력ㄹ 150[mmHg]에서 24시간 이상의 내구성을 얻을 수 있었다. 그리고, 용혈에 대하여 검토한 결과 4매 임펠러의 1H 는 0.0561[g/100L]이고, 6매 임펠러의 경우는 1H=0.214[g/100L]을 얻을 수 있었다. 이상의 실험결과는 심장내 이식 축류형 혈액펌프의 실현 가능성을 보여 주는 것으로 앞으로 큰 기대를 걸수 있다고 생각된다.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1996년도 제24회 추계학술대회
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• pp.168-175
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• 1996

This paper reports on theoretical study of the pressure overshoot in the delivery ports and pressure rising within balanced type vane pump. Pressure overshoot occur due to the accelerated fluid through the notch, so, result in pressure ripple, flow ripple, and noise. For calculating the pressure rising and fluctuations of pressure, we have modeled mathematically used continuity equation based on compressibility and momentum equation considered fluid inertia in the notch, and analyzed simultaneously. As a results of analysis, we have found oscillation of pressure and compression chamber pressure depend on the rotational speeds, bulk modulus of working fluid, notches, number of vane and camring. Using the model, notches have been shown to be important design factor in relaxing the rapid pressure rising and reducing the amplitudes of pressure overshoot.

• Tribology and Lubricants
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• 제14권3호
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• pp.59-64
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• 1998

This paper presents the deformation characteristics of cam ring in a balanced type vane pump. Cam ring is operated in the high-pressure condition. Therefore the local deformation of cam ring affects the characteristics of compression, vane motion and noise and vibration. We analyzed the deformation of cam ring for the three types by using the finite element method. The deformed shape of cam ring and the effects of deformation on the compression are presented. As a result of analysis, we know that the right hole of the cam ring has advantage for reducing the pressure overshoot.

• 유공압시스템학회논문집
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• 제8권2호
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• pp.8-16
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• 2011

It is hard and complicated to analytically derive the volumetric-displacement formula of a gerotor pump/motor. Analytical formulas for calculating the volumetric-displacement are derived in this work, which is relatively easy and based upon vane lengths. The vane lengths mean the distances from axis of inner rotor or outer rotor to contact points between inner and outer rotors. Two kinds of formula were studied for two different kinematic motions of rotors. The first one is the case that outer rotor is fixed in space and inner rotor is in mixed motion of planetary revolution and rotation with respect to the spinning axis. And the second is the case that both inner and outer rotors simultaneously rotate. The proposed formula is verified through comparison with volumetric-displacement obtained from numerical CAD calculation.

• Tribology and Lubricants
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• 제6권2호
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• pp.43-49
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• 1990

The Dynamic Behavior in line contacts between the vane tip and camring in an oil hydraulic vane pump with intravanes has been investigated. Variations of the radial acting force of a vane were calculated from previously measured results of dynamic infernal pressure in four chambers surrounding a vane, and variations of the behavior were estimated in both the rotational speed range from 1200 to 2700 rpm and in the delivery pressure range from 10 to 21Mpa. The results indicate the variations of the radial acting force. Under the standard operating condition (to 14 Mpa, 1800 rpm), the radial acting force on the vane is governed by internal dynamic pressures, but it is more influenced by rotating speed at higher than 2000 rpm relatively.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1998년도 제27회 춘계학술대회
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• pp.198-205
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• 1998

Recently, according as the supply of power steering system has been diffused, for the comfortable driving condition, the problem to reduce the noise and vibration of this system suddenly appeared. This system can be classified two systems of the pipe line and the pump. In this paper, it is described about the noise characteristic with the camring profile of the hydraulic vane pump. As a result, when it excesses tolerance, the noise is increased. Moreover, in the case of the same of cam-ring, the effect of the rotating speed is larger than the discharge pressure.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.555-556
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• 2008

• International Journal of Fluid Machinery and Systems
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• 제2권1호
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• pp.31-39
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• 2009

The flow instability in a low specific speed mixed-flow pump, having a positive slope of head-flow characteristics was investigated. Based on the static pressure measurements, it was found that a rotating stall in the vaned diffuser occurs at about 65% flow rate of best efficiency point (BEP). A dynamic Particle Image Velocimetry (DPIV) measurement and the numerical simulations were conducted in order to investigate the flow fields. As a result, the diffuser rotating stall was simulated even by Computational Fluid Dynamics (CFD) and the calculated periodic flow patterns agree well with the measured ones by DPIV. It is clarified that a periodical large scaled backflow, generated at the leading edge of the suction surface of the diffuser vane, causes the instability. Furthermore, the growth of the strong vortex at the leading edge of the diffuser vane induces the strong backflow from the diffuser outlet to the inlet. The scale of one stall cell is covered over four-passages in total thirteen vane-passages.

• 한국수소및신에너지학회논문집
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• 제31권3호
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• pp.293-301
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• 2020

This paper describes a numerical study on the improvement of performance of the 2 vane pump impellers. The design of these impellers was optimized using a commercial computation fluid dynamics code and design of experiments. Geometric design variables were defined by the impeller blade angle distribution. The objective functions were defined as the total head, total efficiency and solid material size of the impellers. The importance of the geometric design variables was analyzed using 2^k factorial designs. The interaction between the total head, total efficiency and solid material size, according to the impeller blade angle distribution, is discussed by analyzing the 2^k factorial design results.